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Goodwill and Other Identifiable Intangible Assets, Net (Tables)
 3 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets were (in thousands):
 
December 31, 2018
 
September 30, 2018
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
57,821

 
$
(49,113
)
 
$
8,708

 
$
58,102

 
$
(48,693
)
 
$
9,409

License agreements
102

 
(53
)
 
49

 
102

 
(46
)
 
56

Patents and trademarks
15,748

 
(12,501
)
 
3,247

 
15,701

 
(12,242
)
 
3,459

Customer relationships
46,432

 
(22,024
)
 
24,408

 
46,605

 
(21,049
)
 
25,556

Non-compete agreements
600

 
(240
)
 
360

 
600

 
(210
)
 
390

Order backlog
1,800

 
(1,800
)
 
—

 
1,800

 
(1,350
)
 
450

Total
$
122,503

 
$
(85,731
)
 
$
36,772

 
$
122,910

 
$
(83,590
)
 
$
39,320
Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets
Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2019 and the five succeeding fiscal years is (in thousands):
2019 (nine months)
$
6,283

2020
8,297

2021
7,722

2022
6,853

2023
4,668

2024
3,995
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill are (in thousands):
 
Three months ended
December 31,
 
2018
 
2017
Beginning balance, October 1
$
154,535

 
$
131,995

Acquisitions
—

 
17,341

Foreign currency translation adjustment
(957
)
 
(3
)
Ending balance, December 31
$
153,578

 
$
149,333